Hydraulic Sinker Drill - Tool-Smith
Hydraulic Sinker Drill - Tool-Smith
Hydraulic Sinker Drill - Tool-Smith
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
• The hydraulic system should provide a flow of 7-9<br />
gpm/26-34 lpm at an operating pressure of 2000 psi/140<br />
bar. Recommended relief valve setting is 2100-2250<br />
psi/145-155 bar.<br />
The system should have no more than 250 psi/17 bar<br />
backpressure measured at the tool end of the operating<br />
hoses. The system conditions for measurement are at<br />
maximum fluid viscosity of 400 ssu/82 centistokes<br />
(minimum operating temperatures).<br />
The hydraulic system should have enough heat<br />
rejection capacity to limit the maximum oil temperature<br />
to 140°F/60°C at the maximum expected ambient<br />
temperature.<br />
The hydraulic system should have a minimum of 25<br />
micron filtration. Stanley recommends using filter<br />
The SK58 <strong>Sinker</strong> <strong>Drill</strong> is designed to be used to drill<br />
holes in rock such as blast holes.<br />
A rock bit containing carbides is attached to drill steel<br />
which is inserted into the tool. The tool incorporates a<br />
reciprocating piston and a varible speed hydraulic<br />
motor. During the drilling process, the piston hammers<br />
on the drill steel and the hydraulic motor rotates the drill<br />
steel. It is the pounding and rotating motion of the rock<br />
bit that causes the rock to fracture into small cuttings.<br />
It is necessary to extract the rock shavings during the<br />
drilling process. If the rock shavings are not extracted,<br />
the rock bit will sit on top of the shavings, which in<br />
turn, will prevent the rock bit from penetrating into the<br />
rock.<br />
On SK58110, SK58120, and SK58310 models, air is<br />
introduced into the drill steel via a valve in the tool to<br />
blow the rock cuttings out of the hole. On the SK58130<br />
model, water is used to flush out the rock cuttings.<br />
The air requirements for effective drilling are 30 cfm at<br />
120 psi. The air supply is furnished by an air compressor.<br />
SK58 <strong>Sinker</strong> <strong>Drill</strong>s are designed to be operated and<br />
controlled by one individual. The rotation speed of the<br />
drill steel and amount of air introduced into the drill<br />
steel is adjusted by the operator based on an experience<br />
HYDRAULIC SYSTEM REQUIREMENTS<br />
elements sized for a flow of at least 30 gpm/114 lpm for<br />
cold temperature startup and maximum dirt holding<br />
capacity.<br />
The hydraulic fluid used should have a viscosity<br />
between 100 and 400 ssu/20 and 82 centistokes at the<br />
maximum and minimum expected operating temperatures.<br />
Petroleum base hydraulic fluids with antiwear<br />
properties and a viscosity index over 140 ssu/28<br />
centistokes will meet the recommended requirements<br />
over a wide range of operating temperatures.<br />
The recommended hose size is .500 inch/12 mm I.D.<br />
up to 50 ft/15 m long and .625 inch/16 mm I.D. minimum<br />
up to 100 ft/30 m long.<br />
Quick disconnect couplings must conform to NFPA<br />
T3.20,15/EHTMA specifications.<br />
PRINCIPLE OF OPERATION<br />
factor for the particular application. Incorrect rotation<br />
speed and/or inadequate extraction of the rock cuttings<br />
will significantly reduce drilling effectiveness and result<br />
in substantially increased drilling time.<br />
The tool can drill up to a 3 in./75 mm hole up to 20 feet/<br />
6 meters deep in rock. The tool has been used for other<br />
applications such as dowel drilling and gas leak detection.<br />
Because the tool has been specifically designed to be<br />
operated by an individual, it should never be mounted to<br />
and operated from a machine such as a drilling rig or<br />
small excavator. If a requirement exists to machine<br />
mount the tool, the application must first be approved by<br />
Stanley Engineering. Failure to obtain this approval can<br />
result in tool failure and void the warranty.<br />
See the "OPERATING INSTRUCTIONS" section of this<br />
manual for specific operating instructions.<br />
6